IB/ipath: strncpy() doesn't always NUL-terminate

strlcpy() will always null terminate the string.  node_desc is not
guaranteed to be NUL-terminated so just use memcpy().

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/hw/ipath/ipath_file_ops.c b/drivers/infiniband/hw/ipath/ipath_file_ops.c
index 2317398..38a2870 100644
--- a/drivers/infiniband/hw/ipath/ipath_file_ops.c
+++ b/drivers/infiniband/hw/ipath/ipath_file_ops.c
@@ -1616,7 +1616,7 @@
 		pd->port_cnt = 1;
 		port_fp(fp) = pd;
 		pd->port_pid = get_pid(task_pid(current));
-		strncpy(pd->port_comm, current->comm, sizeof(pd->port_comm));
+		strlcpy(pd->port_comm, current->comm, sizeof(pd->port_comm));
 		ipath_stats.sps_ports++;
 		ret = 0;
 	} else